Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Long-Term Incentive Plan (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Long-Term Incentive Plan (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Compensation Expense and Forfeitures
Capitalized compensation cost related to shares issued to design and construction employees			$ 242	$ 246
Restricted Shares
Compensation Expense and Forfeitures
Amortization Expense, including forfeitures	$ 4,659	$ 3,064	7,411	5,271
Capitalized compensation cost related to shares issued to design and construction employees	$ 125	$ 129	$ 242	$ 246
Restricted Shares \| Minimum
Long-Term Incentive Plan
Vesting period			3 years